Starfish

He modified the glock just because he had a short magazine for another glock model and just to utilize tht he ruined the gun

I'm no a Glock owner but I've read many reports from Glock owners. They even have a name for the event. They call it the Kaboom. The cartridge is almost always the .40 S&W caliber The .40 S&W is a high pressure round and appearantly a portion of the cartridge case is unsupported. On discharge, the case splits, allowing hot gases to escape downward, pushing out the magazine and possibley damaging other parts of the gun.